simplex-chat/website/src/css/design3-nav.css

:root {
    --nav-color: #001796;
}

:root.dark {
    --nav-color: #ffffff;
}

body.change-nav-color {
    --nav-color: #001796;
}

@media screen and (min-width: 950px) {
    .logo {
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom-right-radius: 12px;
        padding-right: 24px;
        transition: all 0.3s ease;
    }

    .dark .logo {
        background: rgba(19, 29, 73, 0.005);
    }

    nav#menu {
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        padding: 0px 50px;
        border-bottom-right-radius: 12px;
        border-bottom-left-radius: 12px;
        transition: all 0.3s ease;
    }

    .dark nav#menu {
        background: rgba(19, 29, 73, 0.005);
    }

    .right-links {
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom-left-radius: 12px;
        padding-left: 24px;
        transition: all 0.3s ease;
    }

    .dark .right-links {
        background: rgba(19, 29, 73, 0.005);
    }
}

/* NavBar */
header#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 50000;
    background: none;

    display: flex;
    align-items: center;
    justify-content: center;
    height: 54px;
}

header#navbar>a.logo {
    position: absolute;
    left: 0px;
    padding-left: 16px;
    height: 100%;
    /* display: flex; */
    align-items: center;
}

header#navbar>a.logo img {
    height: 32px;
    width: auto;
}

header#navbar nav#menu>ul>hr {
    display: none;
}

header#navbar nav#menu ul.sub-menu hr {
    border-top-width: 1px;
    height: 1px;
    width: 100%;
    color: #000;
    opacity: 0.2;
}

.dark header#navbar nav#menu ul.sub-menu hr {
    color: #fff;
}

header#navbar ul {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 49px;
    list-style: none;
}

header#navbar ul a {
    font-family: "Manrope", "GT-Walsheim", sans-serif;
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 0;

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    white-space: nowrap;
}

header#navbar ul a span {
    display: flex;
    height: 100%;
    align-items: center;
    justify-content: center;
}

header#navbar ul a>span:first-child {
    transform: translateY(-1.5px);
}

header#navbar ul a span svg {
    fill: #001796;
    width: 10px;
    height: auto;
    transition: all 0.5s ease;
}

.dark header#navbar ul a span svg {
    fill: #fff;
}

@media screen and (min-width: 950px) {
    header#navbar nav#menu>ul>li>a {
        color: var(--nav-color);
    }

    header#navbar nav#menu>ul>li>a svg {
        fill: var(--nav-color);
    }

    header#navbar nav#menu li.nav-link:hover span svg {
        transform: rotate(180deg);
    }
}

header#navbar ul.sub-menu {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0.5rem;
    max-height: calc(100vh - 70px);
    position: absolute;
    background: #fff;
    top: calc(100% + 8px);
    padding: 16px 0;
    min-width: 180px;
    border-radius: 8px;
    transition: all .3s ease !important;
    overflow: auto;
    visibility: hidden;
    opacity: 0;
}

.dark header#navbar ul.sub-menu {
    background: #181e43;
}

header#navbar ul.sub-menu li a {
    padding: 3px 20px;
    font-weight: 400;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 4px;
    color: #001796;
}

.dark header#navbar ul.sub-menu li a {
    color: #ffffff;
}

header#navbar ul.sub-menu li a img {
    height: 1rem;
}

header#navbar .nav-link.flag-container ul.sub-menu li a {
    display: flex;
    align-items: center;
    gap: 16px;
    white-space: nowrap;
}

header#navbar nav#menu,
header#navbar nav#menu>ul {
    height: 100%;
}

header#navbar .nav-link {
    position: relative;
}

header#navbar .nav-link:hover .sub-menu,
header#navbar .nav-link:focus-within .sub-menu {
    visibility: visible;
    opacity: 1;
    margin-top: 0;
}

.flag-container>a {
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: #001796;
    text-decoration: none;
}

.dark .flag-container>a {
    color: white;
}

.flag-container>a svg {
    fill: #001796;
    width: 10px;
    height: auto;
}

.dark .flag-container>a svg {
    fill: white;
}

@media screen and (min-width: 950px) {
    .flag-container>a {
        color: var(--nav-color) !important;
    }

    .flag-container>a svg {
        fill: var(--nav-color) !important;
    }
}

.flag-container>a p {
    font-size: 17px;
    font-weight: 500;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    line-height: 1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.flag-container .sub-menu a div {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flag-container .sub-menu {
    top: 100%;
    right: 0;
}

header#navbar button.theme-switch-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
}

header#navbar button.theme-switch-btn svg {
    width: 18px;
    height: auto;
}

header#navbar button.theme-switch-btn svg path {
    fill: #001796;
    transition: all 0.3s ease;
}

.dark header#navbar button.theme-switch-btn svg path {
    fill: white;
}

@media screen and (min-width: 950px) {
    header#navbar button.theme-switch-btn svg path {
        fill: var(--nav-color) !important;
        transition: all 0.3s ease;
    }
}

.right-links {
    position: absolute;
    top: 0;
    right: 0px;
    padding-right: 16px;
    height: 54px;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

button#cross-btn {
    background-color: transparent;
    border: none;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

#cross {
    fill: #001796;
    width: 13px;
    height: auto;
}

.dark #cross {
    fill: #ffffff;
}

#mobile-header {
    display: none;
    padding: 0 1rem;
}

#mobile-header a.logo img {
    height: 32px;
}

#mobile-header button#hamburger {
    height: 36px;
    background-color: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

#mobile-header button#hamburger svg {
    fill: var(--nav-color) !important;
    width: 20px;
    height: auto;
}

@media (max-width: 949px) {
    #mobile-header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 54px;
        background: transparent;

        display: flex;
        align-items: center;
        justify-content: space-between;
        z-index: 50000;
    }

    header#navbar {
        height: 100%;
        width: 100%;
        background: #fff;
        visibility: hidden;
        opacity: 0;
        transition: all .3s ease;
        transform: translateX(-100%);
    }

    .dark header#navbar {
        background: #0a0f2b;
    }

    header#navbar.open {
        visibility: visible;
        opacity: 1;
        transform: translateX(0);
        z-index: 60000;
    }

    header#navbar>a.logo {
        height: fit-content;
        top: 16px;
    }

    header#navbar>a.logo img {
        height: 28px;
    }

    .right-links {
        top: 0px;
    }

    header#navbar ul a span svg {
        width: 18px;
    }

    header#navbar nav#menu>ul {
        flex-direction: column;
        justify-content: flex-start;
        gap: 0;
    }

    header#navbar nav#menu {
        position: fixed !important;
        top: 54px;
        left: 0;
        width: 100%;
        height: calc(100% - 54px);
        overflow: auto;
        padding: 0.5rem 0;
    }

    header#navbar nav#menu .nav-link {
        width: 100%;
    }

    header#navbar nav#menu .nav-link a {
        font-family: "Manrope", "GT-Walsheim", sans-serif;
        font-weight: 300;
        font-size: 18px;
        width: 100%;
        justify-content: space-between;
        justify-content: flex-start;
        gap: 10px;
        padding: 0px;
        padding: 6px 2rem;
        color: #001796;
    }

    .dark header#navbar nav#menu .nav-link a {
        color: #ffffff;
    }

    header#navbar nav#menu .nav-link>a {
        font-size: 28px;
        padding: 1rem 2rem;
    }

    header#navbar nav#menu ul.sub-menu hr {
        width: 100%;
    }

    header#navbar nav#menu ul.sub-menu hr {
        margin: 1rem 2rem;
        width: calc(100% - 4rem);
    }

    header#navbar nav#menu ul.sub-menu {
        position: static;
    }

    header#navbar nav#menu .sub-menu {
        max-height: 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all .7s ease !important;
        overflow: hidden;
        border-radius: 0;
        background-color: transparent;
        margin-top: 0;
        padding: 0rem 1.5rem;
        gap: 0;
    }

    header#navbar nav#menu .sub-menu li {
        width: 100%;
    }

    header#navbar nav#menu .sub-menu li a {
        font-family: "Manrope", "GT-Walsheim", sans-serif;
        font-weight: 300;
        width: 100%;
    }

    .dark header#navbar nav#menu .sub-menu li a {
        font-weight: 200;
    }

    header#navbar nav#menu .active .sub-menu {
        max-height: 1000px;
        transform: translateY(0px);
        padding: 0.5rem 1.5rem;
        opacity: 1;
        visibility: visible;
        margin-top: 0;
    }

    button#cross-btn {
        display: flex;
        cursor: pointer;
    }
}

/* underline animation on hover */
@media (min-width:950px) {
    .nav-link-text {
        display: inline-block;
        position: relative;
    }

    .nav-link-text::before,
    .active .nav-link-text::before {
        content: "";
        position: absolute;
        width: 0;
        height: 1px;
        bottom: 0;
        right: 0;
        background-color: var(--nav-color);
        transition: width 0.25s ease-out;
    }

    .nav-link:hover .nav-link-text::before,
    .active .nav-link-text::before {
        width: 100%;
        left: 0;
        right: auto;
    }
}

#mobile-header.cover {
    background: #d7fbfe09;
}

.dark #mobile-header.cover {
    background: #283b630a;
}

#mobile-header.main {
    background: #ffefd60e;
}

.dark #mobile-header.main {
    background: #fff6e00a;
}

#mobile-header.nav-open {
    background: #ffffff0c;
}

.dark #mobile-header.nav-open {
    background: #0a0f2b0f;
}

#mobile-header.footer {
    background: #d3e9ff11;
}

.dark #mobile-header.footer {
    background: #080d250e;
    --nav-color: #ffffff;
}